QUALIDADE DE ENERGIA DURANTE PARTIDAS DE MOTORES DE INDUÇÃO TRIFÁSICOS: análise de distorções harmônicas

Abstract

This work analyzes the power quality during three-phase induction motors starters, highlighting harmonic distortions. It is of great importance to obtain the correction of disturbances when the problem is analyzed in the financial sense of a company, that is, the faster the disturbances are eliminated in the equipment, the more savings the industries will have. The studies begin in the laboratory of machines of the University Center of the South of Minas, approaching then a three-phase motor of induction of 6 hp for the analyzes to be done. The objective of this study is to carry out analyzes of the quality of electric power in the three-phase machine, triggering it with three different starting methods. Thus, the study will focus on the quality of energy after the method that drives the three-phase motor, analyzing harmonic distortions and which disturbances are caused in the machine. This task will be achieved through the use of FLUKE model 435 power quality equipment in laboratory tests and through literature reviews. In the tests the three starting methods used are: star-delta key, frequency inverter and soft-starter. The purpose of these methods is the reduction of the starting current and the analysis of the 3rd and 5th harmonic that each game presents in its three phases, also obtaining the total distortion at the moment of the activation. Finally, after obtaining the data and through the analyzes made, the research presents as final result the most feasible starting method to be used in the chosen machine.